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53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
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#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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namespace ns
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{
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struct person
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{
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std::string name = "John Doe";
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std::string address = "123 Fake St";
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int age = -1;
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person() = default;
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person(std::string name_, std::string address_, int age_)
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: name(std::move(name_)), address(std::move(address_)), age(age_)
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{}
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};
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void to_json(nlohmann::json& nlohmann_json_j, const person& nlohmann_json_t)
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{
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nlohmann_json_j["name"] = nlohmann_json_t.name;
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nlohmann_json_j["address"] = nlohmann_json_t.address;
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nlohmann_json_j["age"] = nlohmann_json_t.age;
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}
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void from_json(const nlohmann::json& nlohmann_json_j, person& nlohmann_json_t)
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{
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person nlohmann_json_default_obj;
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nlohmann_json_t.name = nlohmann_json_j.value("name", nlohmann_json_default_obj.name);
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nlohmann_json_t.address = nlohmann_json_j.value("address", nlohmann_json_default_obj.address);
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nlohmann_json_t.age = nlohmann_json_j.value("age", nlohmann_json_default_obj.age);
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}
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} // namespace ns
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int main()
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{
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ns::person p = {"Ned Flanders", "744 Evergreen Terrace", 60};
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// serialization: person -> json
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json j = p;
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std::cout << "serialization: " << j << std::endl;
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// deserialization: json -> person
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json j2 = R"({"address": "742 Evergreen Terrace", "age": 40, "name": "Homer Simpson"})"_json;
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auto p2 = j2.get<ns::person>();
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// incomplete deserialization:
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json j3 = R"({"address": "742 Evergreen Terrace", "name": "Maggie Simpson"})"_json;
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auto p3 = j3.get<ns::person>();
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std::cout << "roundtrip: " << json(p3) << std::endl;
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}
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